The flashing only going part way into the wall will merely stop excess water running down the outside of the wall and between the wall and roof.
How to flash a shed roof to a wall.
One common method is to lay the edge metal under the eaves membrane and over the rake.
Vent the shed roof by installing the end wall flashing on top of strips of your wall strapping cut the same height as the vertical leg of the flashing.
Ensure the vent is nailed at each edge 2 in.
Flexible flashing tape seals the eave to the wall.
To do the job properly the flashing should go right through the block wall and thereby keep the lower wall dry.
Nail length should penetrate through roof decking.
Two ways to flash roof edges.
Above this start your wall strapping and cladding.
Nail the vent to the wall with matching spacing of nails.
If installed along the foundation the membrane should cover the joint where the sill meets the foundation.
Iws is used in conjunction with step flashing or 4x5 wall flashing to create a water tight junction.
Above the roof sheathing.
It should tuck under the sheathing wrap above and over the flashing below.
I cut the tape so that it laps onto the housewrap above and 3 in.
That lip is then set into a reglet or groove in this case cut into the mortar joint of the brick wall above.
To install the roof wall flashing above the builder bent the top edge of the flashing into a 90 degree lip about 2 cm in width.
Above a lower roof where it abuts the wall in all cases make sure to detail the flashing membrane so that it sheds water.
Most simply use a nominal 6 piece of lumber.
The rough side will be down against the roof and wall and nailed at 2 in from ends along the black nail line in the fabric and two nails evenly spaced between them.
I use a wide piece of flexible flashing tape to protect the area between the subfascia and the wall.
In this video isaac illustrates installation of an 18 w.
Protect the eave from ice dams and sideways rain step one in steep slope roofing is the edge flashing.
The base flashing or apron flashing is the bottom piece.
It is used for roof to wall flashing.
Once the flexible flashing is set i apply a piece of housewrap along the wall where the fascia meets it.
Step flashing is a rectangular piece of flashing bent 90 degrees in the center.
The roof flashing is then placed up behind this through the wall z bar flashing on the outside of the vertical blocking backing material.
Placed opposite to base flashing or above base flashing counter flashing completes the two part team.
